Here’s a dependency you can use… that has an image component with an alt text option…
https://anvil.works/build#clone:4QGV5KUAC3GBQAPH=OJ6CC37KJOJIABNGUMI7FALN
It has two properties - source and alt. You can set these in properties or in code.
self.image_alt_1.source = "_/theme/bad.png"
self.image_alt_1.alt = "Bad"
I think it’s what you’re after…
To use it as a dependency clone the app. (Rename it to ImageAltComponent)
Then in your Main App go to
-
settings -
dependencies - add a dependency -
ImageAltComponent
For those interested here’s the code for the component (no javascript required and much more in an anvil style 
):
class ImageAlt(ImageAltTemplate):
_source = ''
_alt = ''
def __init__(self, **properties):
self.init_components(self, **properties)
@property
def source(self):
return self._source
@source.setter
def source(self, value):
self._source = value
self.html = f'<img src="{self._source}" alt="{self._alt}" style="max-width: 100%; display: block; margin: auto;" >'
@property
def alt(self):
return self._alt
@alt.setter
def alt(self, value):
self._alt = value
self.html = f'<img src="{self._source}" alt="{self._alt}" style="max-width: 100%; display: block; margin: auto;" >'
The initial custom html is as above, but with a placeholder image so that something appears when you add the component into the app design view.